package Person.ith_30;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentManger {
    public static void main(String[] args) {
        Scanner sc  = new Scanner(System.in);
ArrayList<Student> array = new ArrayList<Student>();
        while(true){
        System.out.println("------欢迎来到学生管理系统------");
        System.out.println("1 添加学生");
        System.out.println("2 删除学生");
        System.out.println("3 修改学生");
        System.out.println("4 查看所有学生");
        System.out.println("5 退出");
        System.out.println("请输入你的选择： ");
        String line = sc.nextLine();
        switch(line){
            case "1":
                addStudent(array);
                //System.out.println("添加学生");
                break;
            case "2":
                deleteStudent(array);
                //System.out.println("删除学生");
                break;
            case "3":
                updateStudent(array);
               // System.out.println("修改学生");
                break;
            case "4":
                findStudent(array);
                //System.out.println("查看所有学生");
                break;
            case "5":
                System.out.println("谢谢使用");
                System.exit(0);
        }
        }
    }
    public static void addStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        String sid;
        while(true){
            System.out.println("请输入学生学号： ");
             sid = sc.nextLine();
            boolean flag = isUsed(array, sid);
            if(flag){
                System.out.println("学号已经被使用，请重新输入： ");
            }  else{
                break;
            }
        }

        System.out.println("请输入学生姓名： ");
        String name = sc.nextLine();
        System.out.println("请输入学生年龄： ");
        String age = sc.nextLine();
        System.out.println("请输入学生居住地: ");
        String address = sc.nextLine();
        Student s=  new Student();
        s.setName(name);
        s.setAddress(address);
        s.setAge(age);
        s.setSid(sid);
        array.add(s);
        System.out.println("添加学生成功！");
    }
    public static void findStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);

       if(array.size()==0){
           System.out.println("系统内无学生信息，请先添加后在进行查询—— - ——");
           return ;
       }else{
           System.out.println("学号\t\t\t\t姓名\t\t\t年龄\t\t\t居住地");
           for(int i=0;i< array.size();i++){
               Student s = array.get(i);
                   System.out.println(s.getSid()+"\t"+s.getName()+"\t"+s.getAge()+"\t"+s.getAddress());

           }
       }
    }
    public static void deleteStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入需要删除的学生学号: ");
        String sid = sc.nextLine();
        int index = -1;
        for(int i=0;i<array.size();i++){
            Student s = array.get(i);
            if(s.getSid().equals(sid)){
                index = i;
                break;
            }
        }
        if(index == -1){
            System.out.println("无此学生信息，请确认是否无误");
        }else{
            array.remove(index);
            System.out.println("---删除成功---");
        }
    }
    public static void updateStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要修改的学生学号： ");
        String sid = sc.nextLine();
        int index=-1;
        for(int i=0;i< array.size();i++){
            Student student = array.get(i);
            if(student.getSid().equals(sid)){
                index=i;
                break;
            }
        }
        if(index==-1){
            System.out.println("无此学号，请重新输入");
        }else{


            System.out.println("请输入学生新姓名： ");
            String name = sc.nextLine();
            System.out.println("请输入学生新年龄： ");
            String age = sc.nextLine();
            System.out.println("请输入学生新居住地： ");
            String address =sc.nextLine();
            Student c = new Student();
            c.setSid(sid);
            c.setAddress(address);
            c.setName(name);
            c.setAge(age);
            array.set(index,c);
            System.out.println("---修改成功---");
        }

    }
    public static boolean isUsed(ArrayList<Student> array,String sid){
        boolean flag=false;
        for(int i=0;i< array.size();i++){
            Student s =array.get(i);
            if(s.getSid().equals(sid)){
                flag=true;
                break;
            }
        }
        return flag;
    }


}
